Cooperative Spectrum Sensing Method by Dual Sequential Detection

doi:10.7652/xjtuxb201404018

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Cooperative Spectrum Sensing Method by Dual Sequential Detection

更新时间：2025-04-29

- Cooperative Spectrum Sensing Method by Dual Sequential Detection
- Vol. 48, Issue 4, Pages: 102-108(2014)
- 作者机构：
  
  西安电子科技大学综合业务网国家重点实验室,西安,710071
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201404018
  CLC： TN929.5
- Online First：10 April 2014，
  
  Published：2014
- 稿件说明：
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Cooperative Spectrum Sensing Method by Dual Sequential Detection[J]. 2014, 48(4): 102-108.
DOI：

Cooperative Spectrum Sensing Method by Dual Sequential Detection[J]. 2014, 48(4): 102-108. DOI： 10.7652/xjtuxb201404018.

摘要

针对现有认知传感网在低信噪比条件下感知性能差、感知时间长、协作开销大的问题

提出了一种双重序贯检测的协作频谱感知(CSDS)方法。该方法首先在各传感器节点将数据进行分段处理

以各分段的能量作为一个样本点进行序贯检测

当各节点的对数似然比和大于门限时向融合中心发送协作信息

然后在融合中心再进行序贯检测直到作出判决。理论推导给出了平均样本数、平均感知时间等性能参数的精确表达式。采用Matlab的仿真结果表明:CSDS方法在低信噪比条件下

在保持感知性能的同时

所需平均样本数和平均感知时间低于能量检测的40%

且协作开销较现有协作序贯检测方法显著减少。

Abstract

To solve the problems of spectrum sensing with low signal-noise ratio(SNR)in cognitive radio sensor networks(CRSN)

a cooperative spectrum sensing method by dual sequential detection(CSDS)is proposed

where the data in each sensor are processed in segments. A sequential probability ratio test(SPRT)is taken in each sensor

and a sensor sends cooperative messages to fusion center(FC)when the sum of logarithm likelihood ratio gets beyond the threshold. Then another SPRT is taken in FC until to make a decision. Performance analysis of the average sample number(ASN)and average sensing time(AST)are also carried out. Simulations based on Matlab validate the effectiveness of the method in the low SNR regime. ASN and AST of CSDS present below 40% of those by energy detection

and the cooperative overhead greatly decreases compared with other cooperative sequential detection.

关键词

Keywords

references

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